Are you sure there's no dongle driver setup or anything missing? A lot of the older commercial applications used parallel dongles on the LPT and if the software is expecting that you'd really have some issues. I'm guessing since you had this setup on another PC you did check that? I've done a fair …

I need to get my Sopwith fix.. I recall with older windows (Win95-98) there was a version you could play that had some minor tweaks for CPU speed. But now, with Windows7 everywhere, good luck! I can't find the old versions and the new versions are junk too? Searching the forums it sounds like DosBox …